Scraper-sharpener.



c. 1. BRUNSELL L '1. loHNsoN.

SCRAPEH SHARPENER.

APPLICATION HLED AuG.9, |915.

Patented July 1 1, 1916.

i mi i l mi Specification of Letters Patent.

Patenuted July 11, 1916.

Application filed August 9, 1915. Serial No. 44,432.

To all whom t may concern Be it known that we, CHARLES J.' 'BRUN- snLL and JOHN JOHNSON, citizens of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Scraper-Sharpeners; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable Others skilled in the art to which it appertains to make and use the same.

Our invention has for its obj ect to provide an extremely simple and highly efficient tool or device for sharpening Scrapers of the steel scraper blade type, such as used in scraping wood surfaces by hand, or for that matter, for the use of machines such as employed in scraping floors.

Generally stated, the invention consists of the novel construction and combination of parts hereinafter described and defined in the claims.

The improved scraper sharpening device is illustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views.

Referring to the drawings: Figure l is a perspective view of the improved device; Fig. 2 is a plan view thereof; Fig. 3 is an end elevation of the device showing the front end thereof, to-wit, that end which is in the vicinity of the line marked :r3 m3 of Fig. 2; Fig. 4 is a section taken on the line x4 x4 of Fig. 2; Fig. 5 is a plan view of the device; Fig. 6 is an elevation looking at the front end thereof, to-wit, that end which is in the vicinity of the line r6 x6 of Fig. 5; and Fig. 7 is an end elevation showing a fiat file held'by the device for use in sharpening the scraper blade.

rThe body 1 of the device is preferably made of wood and is of an elongated rectangular general form. On its upper face, it is formed with a raised portion 2 that is rectangular in cross section, and at the sides of which are grooves 3. Outward of the said grooves are guide surfaces 4 that incline slightly outward, being at a right angle to a horizontal or to the upper face of the rectangular central portion 2. In the sides of the body l are grooves 5 that are adapted to receive a portion of a flat file y.

The numeral 6 indicates a rectangular steel blade tempered very hard. rlhe edges of this blade '6 are at a right angle to the faces thereof, and the said blade is tightly set into a groove cut in the raised portion 2both transversely; and vertically oblique to the faces and sides of the raised portion 2. This doubly oblique arrangement of the said blade in the raised portion 2 is highly i1n portant because it presents the upper and end edges of the said blade at the proper angle 'for action-on the steel scraperv blade y1, which is to be sharpened. Also it is highly important that the upper and end edges of the said sharpening blade 6 project but slightly beyond the upper and side edges of the said raised portion 2, substantially as illustrated in the drawinge.

The use of the device for sharpening the scraper blade y is substantially as follows: First the scraper blade, held as shown in Fig. 2, is drawn toward the operator with its flat undersurface held against the upper edge of the sharpening blade 6 (see Figs. 2 and 3). By repeating this drawing action on all four of the edge side faces of the scraper blade y, the fins on the four edges of the said scraper blade will be turned outward into the plane of the faces of the scraper blade. Then by placing the scraper blade (as shown by dotted lines in Figs. 5 and 6) on one of the slightly inclined guide surfaces 4, and drawing the same rearward with the edge of the scraper blade against the ends of the sharpening blade, the ns on the edges of the scraper blade will be turned outward and the scraper blade will be put in the best possible condition for scraping. In practice we have found that by the use of this sharpening tool, scraper blades may be very quickly and efficiently sharpened, and that this may be accomplished by any person with a very little practice, whereas, very considerable skill and considerable more time is required to sharpen a scraper blade by the old or Ordinary operation, wherein a steel bar is drawn over the edges of the scraper blade. Obviously, the various guide surfaces on the body member l make it an easy matter to properly direct the edges of the scraper blade against the edges of the sharpened tool. When the edges of the scraper blade, from repeated sharpening, become rounded, they may be resharpened by inserting the file y into one of the grooves 5 and thenrdrawing the scraper blade over the same, as shown in Fig. 7 using one edge of the body'l as a guide for the scraper blade.

What We claim is:

1. A scraper Sharpener device, comprising a body having a raised elongated portion and a guide surface at one side below the upper surface thereof, and a hard sharpening blade set into the raised portion of said 4blade* having oblique end and edge portions projecting respectively beyond the side and top surfaces of said raised portions.

` 2. A scraper blade sharpening tool com? prisinga body having a raised rectangularV portion and guide surface outward of the side edges and below the top surface of said raised portion, and a hard sharpening blade but below the top of said rectangular raised portion, and a hard sharpening blade set into the said raised portion of said body in a plane that is oblique to the upper and side surfaces thereof, and with the edges of said blade projecting outward of said surfaces.

4. A sraper` blade sharpening tool comprising a body having a raised rectangular portion with a groove at one side thereof, and with a guide surface outward of said grooveslightly above the bottom thereof, but below the top of said rectangular raised portion, and a `hard sharpening blade set into the said raised portion of said body in a plane that is oblique to the upper and side surfaces thereof, and with the edges of said blade projecting outward of said surfaces, the said body, at one projecting edge, havnfgl' a groove adapted t0 receive a portion of a le.

In testimony whereof we aiiix our signatures in presence of two witnesses.

CHARLES J. BRUNSELL. JOHN JOHNSON.

Witnesses: Y

H. D. KrLsoRn, F. D. MERCHANT.

, Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

